test: add test for per-attack image directories and improve error handling

- Add test_generate_test_cases.py to verify each attack uses its own image directory
- Improve error messages in unified_registry for failed imports with more context
- Add null checks in generate_test_cases.py for attack initialization failures
- Reduce excessive max_tokens in judge_utils from 130000 to 10000 for efficiency
- Add missing ThreadPoolExecutor import in qr/attack.py
- Fix missing newline in pyproject.toml

tests/test_generate_test_cases.py

@@ -0,0 +1,53 @@
+from pathlib import Path
+from unittest.mock import patch
+
+from core.data_formats import PipelineConfig
+from pipeline.generate_test_cases import TestCaseGenerator as CaseGenerator
+
+
+def test_run_uses_per_attack_image_dir(tmp_path):
+    config = PipelineConfig(
+        system={"output_dir": str(tmp_path)},
+        test_case_generation={
+            "input": {"behaviors_file": "unused_in_test.json"},
+            "attacks": ["jood", "hades"],
+            "attack_params": {"jood": {}, "hades": {}},
+        },
+        batch_size=1,
+    )
+    generator = CaseGenerator(config)
+
+    behaviors = [{"case_id": 1, "original_prompt": "p", "image_path": "img.jpg"}]
+    captured_image_dirs = {}
+
+    def fake_generate_filename(stage_name, **context):
+        attack_name = context["attack_name"]
+        image_dir = tmp_path / attack_name / "images"
+        output_file = tmp_path / attack_name / "test_cases.jsonl"
+        return image_dir, output_file
+
+    def fake_generate_single_attack_test_cases(
+        attack_name,
+        attack_config,
+        behaviors,
+        batch_size,
+        output_file_path,
+        image_save_dir,
+    ):
+        captured_image_dirs[attack_name] = Path(image_save_dir)
+        return []
+
+    with patch.object(generator, "validate_config", return_value=True), patch.object(
+        generator, "load_behaviors", return_value=behaviors
+    ), patch.object(generator, "_calculate_expected_test_cases", return_value=1), patch.object(
+        generator, "load_results", return_value=[]
+    ), patch.object(generator, "_generate_filename", side_effect=fake_generate_filename), patch.object(
+        generator,
+        "generate_single_attack_test_cases",
+        side_effect=fake_generate_single_attack_test_cases,
+    ):
+        generator.run()
+
+    assert captured_image_dirs["jood"] == tmp_path / "jood" / "images"
+    assert captured_image_dirs["hades"] == tmp_path / "hades" / "images"
+    assert captured_image_dirs["jood"] != captured_image_dirs["hades"]